Wing Knob Thumb Screws & Clamping Nuts — M5 M6 M8 M10, D36 / D55 Flange

Match the thread size (M5, M6, M8, or M10) to the tapped hole or T-nut in your fixture. For bolt length, measure the total stack thickness of the material being clamped, then add enough thread engagement — generally at least 1× the bolt diameter (e.g., 8mm of engagement for M8). For example, clamping a 20mm fence to a 10mm table slot typically calls for a bolt around 30–35mm long. When in doubt, go slightly longer; you can always add a washer to take up slack.

Hand-tightened clamping force depends on the operator's grip strength and the knob diameter. With a D55 flange, you can generally achieve more torque than with D36 due to the larger lever arm. These fasteners are designed for workholding, fixture adjustment, and machine guarding — applications where moderate, repeatable clamping force is needed. They are not intended as structural load-bearing fasteners in high-vibration or heavy-load assemblies. If your application requires a specific torque value, please contact us to confirm suitability.

The zinc plating provides corrosion resistance suitable for typical indoor workshop conditions. For occasional light moisture exposure, the coating generally performs well. However, for prolonged outdoor use, marine environments, or high-humidity settings, we recommend contacting us to confirm suitability or considering stainless steel alternatives. Applying a light machine oil to the threads after installation can extend service life in damp conditions.

Yes — the thread pitches used (M5×0.8, M6×1.0, M8×1.25, M10×1.5) are standard ISO metric coarse, which match the vast majority of metric T-nuts, threaded inserts, and tapped holes found on woodworking tables, drill press tables, and CNC machine beds. Always verify the thread pitch of your T-nut or insert before ordering, as some imported machines use non-standard pitches.

Choose D36 (≈1.42" diameter) when working in tight spaces, narrow slots, or compact jigs where a smaller footprint is needed. Choose D55 (≈2.17" diameter) when you need a larger bearing surface to distribute clamping load — for example, when clamping softer materials like MDF or aluminum extrusions where a small flange might dig in, or when you want more hand torque leverage. The D55 variants are also a good choice for machine handles that are adjusted frequently throughout the day.

Choose the nut-only variant (listed as "M5 -D36 Nuts", "M6 -D36 Nuts", etc.) if you already have a threaded stud, rod, or bolt in place and simply need a wing knob nut to thread onto it for hand-tightening. Choose a bolt variant (e.g., "M6x20mm -D36") if you need a complete thumb screw with a fixed shank length — common when bolting through a slot into a T-nut or threaded insert from above.

In most cases, yes — the 5-pack price per piece is typically lower than buying five individual units. If you're outfitting a full jig, replacing all the knobs on a machine, or stocking a workshop, the 5-pack is generally the more economical choice. If you only need one replacement piece, the single-unit option lets you avoid overstocking.

Both are hand-tightened fasteners, but the grip geometry differs. A wing knob has two or more radial wings extending from a central hub, allowing you to grip and turn with a pinching motion. A T-handle knob has a straight crossbar, letting you apply torque by pushing or pulling the bar ends — similar to a T-wrench. Both styles in this listing are designed for tool-free operation; the best choice depends on your personal preference and the space available around the fastener.